1966-1986
made about 1972
Made in 1975.
Made in 1967.Second year of production.
No such sn in the Diamondback series
In 1969, Colt produced approximately 3,500 Diamondback revolvers chambered in .38 caliber. The Diamondback was introduced in 1966 and gained popularity for its design and performance. The production numbers varied each year, with 1969 being one of the years with a notable output.
You must call Colt to find out.
what is the manufacturing date fo a colt diamondback serial number O72239
You will have to call Colt.
Go to proofhouse.com and click on diamondback.
You will have to call Colt. Published sn data does not show any Diamondback with a sn starting with a P
Go to : www.proofhouse.com
That was 1971.